I just got done building my first frame with steel and carbon. Wasn't quite as easy as I thought but its together. I basically made a whole steel frame and cut the center section out of the top and down tube to glue the carbon tubes in and then used a Taylor Carbon cross seat stay. I was happy with the way it turned out but it hasn't been ridden yet so we'll see. Its being painted right now for a customer and I am curious to see how it rides. If you want to check it out its on my blog http://meechcustombikes.blogspot.com/